Pulverizing-machine



(No Model.) 4 Sheets-Sheen 1'.

y R. D. GATES.

- PULVERIZING MACHINE.

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R. D. GATES. I PULVBRzING MAGHINE. 140.260,092. f Patented June 27, 1882.

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R. D. GATES.

APULVBMZING MGHINEl Patented June'27,-1882.

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PULVBRIZING MAGHINE. 120.260,092. Patented June 21,1882.

UNITED STATES PATENT OFFICE.

RYERSON D. GATES, OF CHICAGO, ILLINOIS.

PULVERIZING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 260,092, dated June 27, 1882.

' Application flied March 1,1882. (No model.)

To all whom it may concern Be it known that I, RYERSON D. GATES, a citizenoftheUnited States,residin g at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Pulverizing- Machine, of which the following is a specication.

My invention relates to improvements in .pulverizng-machines in-which pairs of rollers are used instead of stamps Vor burrs and the nature of my invention willbe clea-rly understood from the following specification and claims and annexed drawings.

In the accompanying drawings, Figure l is an elevation of my improved machine, showing the main gearing for the operation of the pulverizer, parts of the main gear-wheel being "broken away in order to illustrate the meshin a line parallel with the main shaft and showing the said shaft in elevation. Fig. 5 is a vertical central longitudinal section, in detail, of one pair of the bearings of the rollers. Fig. 6 is a top view of the same, and Fig. 7 is a detail top view of a doubly-inclined distributing-chute used below the screen ofthe highest pair of rollers.

Similarletters refer to similar parts throughout the several views.

In the drawings, A A are two similar halves of a shell-frame united by bolts a. The forni of the shell-frame is mainly that of a drum, legs a being added in order to steady the frame in an upright position and fasten it to a suitable foundation. In the center of said frame a main shaft, B, is hung, which is at one end provided with aninternallytoothed gear-wheel, C. This gear-wheel C drives a number of gearwheels, d, upon the shafts d of rollers D. The gear-wheels l mesh into gear-wheels d2 on shafts d3 of rollers D', which are thus mated with the rollers D. The two rollers D D are hungin bearings E E, the former, Fl, being fastened by a bolt, e, Fig. 5, to a suitable langefcz, of

the shell-frame A A. The bearing E has a horizontal lian ge, e2, with a lon gitndinal guidegroove, e3, and the bearing E rests upon the flange e2 of the bearing E and has a longitudinal rib, c4, formed on its bottom, which rib fits into the groove e3..

At the bottom of the groove c3 a conical slot, c5, is provided in the angeez, through which a screw, c, passes into the bearing E. By

vthese means the two bearings E E are prevented from deviating in a vertical direction, while the bearing E maymove horizontally to or from the bearing E', thus allowing the rollers D D' to be parted more or less from each other. The said rollers are held close to each other by means of an oblong spring-frame, F, the rear end of which bears against the outer end of the bearing E. The front end of the frame F stands ot't' a sufficient distance from lthe bearing E to allow a sliding nut, f, and

tension-spring f' to be applied and adjusted therein between bearing E and the forward end of the frame F.

The adjustmentof the nut and spring is effected by means of a hand-screw contrivance, G, consisting of a shank, g, having a handwheel, g', at one end, a screw-threaded portion, g2, and a guiding extension, g4, beyond said screw threaded portion, g2, at the other end. The guiding-extension g4 enters a socket, g5, in the stationary bearing, while the screw-threaded portion g2 passes through and engages with the sliding nut f, which is held within the frame F and kept from turning by means of anges f2. A collar, g3, on the shank g prevents the hand-screw from being pushed out of the frame by the tension-spring f', which is placed between the sliding nut f and the bearing E', while the socket g5 allows the device G to move with the fra-me F and bearing E when the pressure of the rollers requires to be regulated. The pressure of the spring upon the sliding nut f causes the frame F to bear against thel slidingbearing E, and thus forces the rollers D D against each other. By screwing the sliding nut f toward the rigid bearing E the rollers D D will be caused to bear with more force against each other, and with less force accordingly as the nut f is moved in a reverse direction.

The adjustmentof the pressure upon the roll- IOO ers can be eiected by the screw deviceGoutside the frame of the machine and outof the range of the gear-wheels with perfect safety, and damaged bearings can easily be removed and new ones substituted, as they need not be specially tted to their supports on the frame F, as is the case with roller-bearings of ordinary construction. This manner of regulating the pressure of the rollers does not interfere with the adjustment of the wheels d. d2 to a proper working relation with the gear-wheel C, for it will be seen that the frame F, with the parts attached, can be moved backward or forward by simply loosening the boltse and moving the bearings E upon the flanges a2.

The pair of rollers D2 D3 is in every respect similar to the pair D Ddescribed, except that this pair is notdriven bythe internally-toothed gear-wheel C, as this would Cause said pair to be revolved in the wrong direction. l have therefore provided the other end of the main shaft B with a gear-wheel,C/, which drives another gearwheel, C2, on the shalt d* of the roller Dz. The shafts d4 and di of the rollers D2 D3 are also provided with wheels d d?, meshing into each other, and thus operating these rollers. This arrangementof wheels may, however, be substituted by any other suitable arrangement, and I therefore may not in practice conine myself to this special construction.

Below the uppermost pair of rollers D D adoubly-inclined screen, H, Fig. 3,is provided, which is suitably hung between the shell-frame of the machine and conducts the coarser particles dropped bysaid rollers equallydivided to thenext pairs D D',D2D3 below, whilea doublyinclined chute, H', conducts the finer particles from the upper pair of rollers D D to points outside the ends of the lowest pair D D' and inside annular anges, a3, and thence upon a revolving screen or sieve, through which they escape and pass off into a receiving or discharging chamber of frame A A.

The middle pairs of rollers are each provided with an inclined screen, H2, and these screens receive the ground products of the said rollers and conduct the coarser particles to the lower pair of rollers to be reground, while the finer particles descend through the screens H2 upon the screen j3, and thence into the receiving or discharging chamber below. The lowest pair of rollers is not provided with a'guidescreen, as it also performs a fine-grinding or finishing operation.

One of the roller-shafts, d', has a pulley, i,

- which, by means of a belt, i', drives another pulley, tz, on a shaft, I. This shaft I is suitably hung to the shell-frame of the machine, and is provided with a number of cog-wheels, i3 i4, which gear into toothed rings j, formed on the circumference of the revolving cylindrical frame J of the endless screen or sieve ji, which encircles the pairs of rollers, and within which said rollers are operated, while the said screen, with its frame, revolves around them upon suitable friction-roller supports, w,

at bottoni of the shell-frame. The cylindrical frame J has open ends, and' is by preference made of two annular ribbed or hanged plates, j', upon which the toothed rings are applied or formed, and to which a circumferential cylindrical portion, j2, is suitably fastened, the same being applied between the plates and upon uppertlangesthereof. Theannularscreen j, which is inside of and some distance from said cylindrical portion jz, is fastened to an `annular rib, .7, of each of the plates j by suitable means, and inside of the screen j are provided oblique elevating-partitions j, the same being applied between the plates j j and set with their outer edges free from contact with the inner surface of the screenj, so as to form escape-passages j between the rear edges ot' the elevating-partitions and the screening-snrface. The elevating-partitions, by being set oblique within the screen-frame and in relief from the sieve or screen, serve for carrying up the substances fed into the screen from a hopper, K, to be ground or pulverized by the rollers; also, for recarryin g up the substances to be reground after they have been one or more times subjected to the grinding-rollers, and while the partially-ground substances are being re-elevated the fine hour, meal, or other material has freedom to pass back behind the elevating-partitions'through the escape-passages j and out through the meshes of the screen or sieve into a general receptacle for the pulverized material, whi-le the coarser partially-ground substances are discharged between the grinding-rollers, to be further ground 0r pulverized.

The platesj' are provided with outer annular ribs, ja, ittedloosely around annular flanges a3, formed on the inner sides of the shell-frame A A ofthe machine, and by means of the same the un ground and ground products are prevented from falling into the space between the shellframe and revolvingscreen oroutsidethe screen The screen or sieve j3 being of very fine mesh and continuous or endless, only the ne or fully-pulverized particles of grindin gs can leave the screen frame J by falling through the meshes of the screen j3 upon the cylindrical portionjz, and from this latter portion, through an openin g, ji, therein, to the bottom ofthe shellframe, whence they are removed in a suitable manner through an opening, a4, or otherwise.

The mixed coarser and liner particles of the grindings are carried up by the elevators ji of screen j, and from time to time portions of the same slip down between the said elevators and the screen j3, and while the liner particles constantly fall through the screen j 3 the coarser particles are carried up on the partitions j5 until they drop off and pass between the rollers to be subjected to a ne grinding between the lower pair of rollers.

A hopper,K, is suitably provided on one side of the frame, by which hopper the screen is continually supplied with fresh material for grinding, which material is carried up from the IIO bottomof the machine to a position above the top pair of rollers and dropped between said rollers.

All openings in the shell-frame are in practice carefully closed up by means of suitable sliding covers, so that the escape of pulverized and other mate-rial therefrom is rendered impossible. The shaft B is also provided with a pulley, b, which, by means of a belt, is driven from the line-shaft of the mill.

lnstead of the wheels C' C2, above described, a small intermediate gear-wheel could be employed on a'stud of the rigid bearing E' of the roller D2, so as to cause it to mesh intothe internally -toothed gear-wheel (l and the Wheel .d ofthe roller D2, and thus all the wheels d d2 could be arranged on the same side of the machine, allowing free access to the other side.

By my machine a iine grinding of a portion of the substances is eii'ected by each pair of rollers, and this iine-ground portion is at once discharged upon the revolving sieve or screen j, and thus the alreadyiine enough substances are not subjected several times to a recrushing or regrinding operation, and the labor and wear and tear of the machine are lessened, while the amount of work performed in a given time with a given number of pairs of rollers is increased.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. In a grinding or pulverizing machine, the combination, with a surroundin g inclosin g-case provided with supply and discharge passages, ot'a revolving screen, j, having its periphery formed of suitable screening material, and a pair of crushing-rollers arranged within the revolving screen and out of contact with the screening-surface, substantially as and for theY 5o vided with elevating-partitionsj, and the escape-passages ja, in combination with a pair ot' crushing-rollers arranged within the screen j3, and acting to crush the substances independent of any crushing action by any portion of the cylindrical screen, substantially as described.

4. The combination of the revolving screen j3, two pairs of crushing-rollers, D D', D D',with a guide-sieve for conducting ground substances from the one pair of rollers to the other, substantially as described.

5. The combination of the revolving screen ,i3 and three pairs of crushing-rollers; D D', D D', D D', with a guide-sieve which conducts substances from the first to the second pair of rollers and a guide-sieve which conducts substances from the second to the third pair of rollers, the nished substances being screened by the joint action of the sieves and revolving screen j2, substantially as described.

6. The combination of therevolving screen j3, crushing-rollers D D', and guide-sieves H H2, substantially as and for the purpose described.

7. The combination of the distributing-chute H' with the upper sieve, H, and the upper pair of rollers D D', substantially as and ior the purpose described.

8. A revolving screen,j3, having langesj, and friction-rollers w, in combination with an outer inclosing-case, AA', provided with guardflanges c3, a supply-passage or hopper, K,and a discharge-passage, c4, substantially as described.

9. rlhe combination of the revolving screen jg, four pairs of crushing-rollers, D D' D2 D3, guide-sieves H H2, a central shaft, and gearing for revolving the rollers ofthe respective pairs in the proper directions, substantially as described.

j l0. The combination of an outer case, four pairs of crushing-rollers, D D' D2 D3, the driving-gear C, and adjustable bearings outside the case with a revolving elevating-screen j within the case and surrounding the crushingroilers and suitable gearing for imparting motion to the respective pairs of rollers and to the screen, substantially as described.

RYERSON D. GATES. Witnesses:

HENRY A. NORTON, Gao. WOODLAND. 

